Over 200 million people across 37 states were under winter alerts on Sunday morning. Some 1 million were without power.

Reporters from across the NPR Network are covering the storm in each state — the impact and how officials are responding.

Hundreds of thousands of people are without power as heavy snow and ice has downed power lines across the country.

About a million customers were without power Sunday as a massive winter storm coated tree branches and power lines with heavy ice across the South.

Officials urge Americans to stay indoors as a historic winter storm creates "catastrophic" ice conditions and triggers the largest weather alert ever.

Snowfall in one other Pennsylvania city at least tied the record: Williamsport, which tied the record of 9.2 inches in 1958. Again, that was of mid-afternoon, and could be broken with additional snow on Sunday night. The snow prompted several central Pa. government offices to announce that they will be closed on Monday.

A winter storm brought heavy, powdery snow to Maryland on Sunday morning. By mid- to late morning, conditions changed to sleet and freezing rain.